Here are some games that would carry a Switch 2, released in early 2024, through the entire first year.
Super Mario (new 3D title)
This would be a launch-day title for the Switch 2 - being a long-awaited follow-up to Super Mario Odyssey with next-gen graphics, there's no way this game's sales would be dampened by a last-gen 2D title released 6 months prior.
The Legend of Zelda (new 2D title)
An exclusive new 2D Zelda would be absolutely massive for the Switch 2.
Mario Kart 9
Everyone is here! All characters from Mario Kart 8 Deluxe + DLC are present. But, Mario Kart's game engine and physics as a whole is re-vamped from the ground up! This truly is next-gen Mario Kart, and feels completely new. People would lose their minds.
Donkey Kong (new 2D title)
A brand new exclusive 2D Donkey Kong platformer would be a great first-year title to give the Switch 2 some momentum.
Unannounced Monolith Soft RPG
This would satisfy those craving a core next-gen RPG experience.
Elden Ring
This would be massive for the Switch 2, and would reach far, far more people than the Deck release did.
The Legend of Zelda: Wind Waker 4K
This would avoid re-releasing the exact same HD remake with the exact same enhancements.
The Legend of Zelda: Twilight Princess 4K
Same as above. They could even be released as a dual-pack.
Various re-releases of Nintendo Switch titles upgraded for the next-gen experience (4K, 60fps, almost zero loading times)
The Legend of Zelda: Breath of the Wild (4K 60fps)
Hyrule Warriors: Age of Calamity (4K 60fps)
Xenoblade Chronicles 2 (4K 60fps)
Xenoblade Chronicles 3 (4K 60fps)
Astral Chain (4K 60fps)
Various third-party releases (or re-releases) that would only run on the Switch 2
Elden Ring
Dark Souls 2
Dark Souls 3
Final Fantasy 16
Doom 2016 (4K 60fps)
The Witcher 3 (better graphics I guess)
Given the above, the Switch 2 could have a consistent release schedule of monstrously popular titles throughout next year - even if it were to release in January.